I need ideas on how to get rid of neck pain.

Yesterday, I must’ve laid down incorrectly on now the back of my neck on my left side is strained. I took pain killers but that isn’t doing anything for it. Do I use heat pads? I tried icy hot and it did nothing for it as well. I can’t bend my head to look down without feeling I’m stretching the muscle too far. I would appreciate any home remedies.